Would you like a smaller waistline? When you work the muscles of your upper back known as the latissimus dorsi, they create a “V “shape in your torso, which in turn makes your waistline look smaller. The Lat Pulldown Machine is the best exercise for this purpose. While you are at it, since you’ve already created a cleavage in the front, why not balance it out with a cleavage in the back? Exercises such as the rear deltoid raise will define your upper back, making you look fabulous in low-back dresses and halter tops. Working your upper back will also improve your posture. Guess what? When you stand up straight, your stomach looks flatter!